1. The sales mix of a company's two products, X and Y, is 2:1. Unit variable costs for both products are $2, and unit selling prices are $5 for X and $4 for Y. The company has $640,000 of fixed costs. a. What is the contribution margin per composite unit? b. What is the break-even point in composite units? c. How many units of X and how many units of Y will be sold at the break even point